Over the course of the day I have been creating quicksearches from sites that i know i search periodically ... here's a few more which i find pretty handy.

Amazon.com/CDNow CD search
url: http://www.amazon.com/exec/obidos/search-handle-url/index=music&field-keywords=%s&store-name=music/002-3744742-0628811
keyword: cd

Amazon.com DVD search
url: http://www.amazon.com/exec/obidos/search-handle-url/index=dvd&field-keywords=%s&store-name=dvd/002-3744742-0628811
keyword: dvd

Internet Movie Database
url: http://www.imdb.com/find?tt=on;nm=on;mx=20;q=%s
keyword: imdb

Tv Tome (info about tv shows)
url: http://www.tvtome.com/tvtome/servlet/Search?searchType=all&searchString=%s
keyword: tv

enjoy.